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Halo Mass in Spiral Galaxies

Published online by Cambridge University Press:  12 April 2016

Ch. K. Terzides
Ch. K. Terzides*
Affiliation:
Max-Planck-Institut fur RadioastronomieBonn, Federal Republic of Germany

Extract

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We have solved the dispersion relation given by the theory of Lynden Bell and Kalnajs (1972) using models with spherical halos under the assumption that the halo population does not participate in the spiral arms. Especially we have studied the conditions under which the solutions of this dispersion relation reach corotation so that the excitation mechanism of the density waves due to the theory of Lynden Bell-Kalnajs is applicable. We have used as basic axisymmetric models the model of Schmidt (1965) (S-model) and the model proposed by Miyamoto and Nagai (1975) (M-model) On these models we have superimposed spherical halos so that in a sphere of radius 20 kpc there exists a given amount of mass with two different density laws: ρ as r-1 and p as r-2.

Type
Part IV: Kinematics and Dynamical Evolution of the Galaxy
Information
International Astronomical Union Colloquium , Volume 45: Chemical and Dynamical Evolution of our Galaxy , September 1977 , pp. 297 - 300
Copyright
Copyright © Geneva Observatory 1977

References

Lynden Bell, D., and Kalnajs, A.J., 1972 M.N.R.A.S., 157, 1.CrossRefGoogle Scholar
Miyamoto, M., and Nagai, R., 1975, Pub.Astr.Soc.Japan, 27, 533.Google Scholar
Schmidt, M., 1965, Stars and Stellar Systems, 5, 513.Google Scholar
Toomre, A., 1964, Ap.J., 139, 1217.Google Scholar